why blender 2.65 viewport are slow …even i made a low poly mesh
Not sure without more information, such as system specs. First thing to check would be to make sure that you have updated graphics drivers. Intel graphics are notorious for not working well with Blender.
How many objects are you trying to display? If its just 3 or 5 you need to upgrade your hardware.
Work & test render faster by making a few selections then use the / key on your numpad to work locally. Less strain on your system.